Question

The volume, V of a gas kept at a constant temperature varies inversely as the pressure, P. If the pressure is 30 pounds per square inch, the volume is 12 cubic feet. What will be the volume when the pressure is 24 pounds per square inch?

Answer 1

Ratios and Proportions.
Volume:Pressure
12:30

?:24=12:30
?/24=12/30
Move 24 across the equal sign
?=12*24/30
?=288/30
?=9.6

The volume would 9.6 cubic feet

Hope this helps!